一种高效的夹心换能器有限元设计方法研究

An Effective Design Method of Piezoelectric Sandwich Transducer Based on Finite Element Analysis

夹心式压电换能器是多种设备的核心器件。该文提出了对换能器前后两部分分别设计和仿真的方法,比传统的按整体进行计算和仿真的方法实现了更高的仿真设计效率:首先,对前后部分分别进行仿真与优化,实现前后部分的谐振一致性;其次,把前后部分模型整合实现对整体的仿真和调整;最后,按最优方案制作换能器,并与传统方法设计的换能器进行实验对比。通过实验证明,按照该文提出的方法,加工装配的换能器不仅研制周期短,且品质因数高、谐振阻抗小、有较大的有效机电耦合系数。

The piezoelectric sandwich transducers（PST） are the key components of many types of equipments.An effective finite element simulation method of the transducers was proposed,in which the front and the back parts of the transducer were designed respectively.Comparing with the conventional simulation and calculation method of the whole transducer,this method has got much higher efficiency.Firstly,the simulation and optimization of the two parts were carried out separately to make sure that the two parts had the same resonance frequency.Then the front and the back models were integrated to realize the simulation and adjustment of the whole transducer.At last,according to the optimal solution,the transducer was fabricated,and a contrasting study with the conventional transducer has been carried out experimentally.The experimental results indicated that the transducer designed had a shorter development time,a higher quality factor,lower harmonic impedance and a higher effective electromechanical coupling coefficient than the PST designed with the traditional method.